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A268567 as a simple table

n a(n)
1 1
2 4
3 42
4 780
5 21552
6 803760
7 38054160
8 2194345440
9 149604053760
10 11794431720960

[1,4,42,780,21552,803760,38054160,2194345440,
 149604053760,11794431720960]

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Last modified August 18 14:22 EDT 2022. Contains 356215 sequences. (Running on oeis4.)